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To count as domestic violence, aggressive physical contact needs to be a repeat activity.
One of the threads at "Jezebel" describes a whole lot of women who got in a single fight essentially simultaneously with dumping a loser. And the guys were by and large not hurt much.
This is NOT domestic violence since it's not about domination or power. It's just a garden-variety minor assault. Shit, that happens to even the least pugilistic guys in middle and high school, at least a handful of times.
As for why abusive girlfriends might be funny in the abstract: it's because it upsets the classical power model, which--in the abstract--is often very funny.
If some woman is repeatedly beating up a boyfriend to dominate him, well that's something else. It's only funny in the abstract.